Biology
Given below is a diagram representing a stage during mitotic cell division in an animal cell. Examine it carefully and answer the questions which follow.
(a) Identify the stage. Give one reason in support of your answer.
(b) Name the cell organelle that forms the 'aster'.
(c) Name the parts labelled 1, 2 and 3.
(d) Name the stage that follows the one shown here. How is that stage identified?
(e) Mention two points of difference between mitosis and meiosis with regard to:
- The number of daughter cells produced.
- The chromosome number in the daughter cells.
Cell Division
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Answer
(a) By observing the given figure we can say that it is the late prophase stage because the nuclear membrane and nucleolus have disappeared.
(b) Centrioles is the cell organelle that form the aster.
(c) The parts are as follows:
- 1 → Centromere
- 2 → Chromatids
- 3 → Spindle fibre
(d) The stage that follows the one shown here is Metaphase. In Metaphase, the centromeres of chromosomes are drawn to the equator by equal pull of two chromosomal spindle fibres that connects each centromere to the opposite poles, forming a metaphasic plate.
(e) Difference between mitosis and meiosis :
| Mitosis | Meiosis |
|---|---|
| It produce two daughter cells. | It produce Four daughter cells. |
| Full set of chromosomes is passed on to each daughter cell. This is the diploid (2n) number of chromosomes. | Only half the number of chromosomes is passed on to each daughter cell. This is the haploid (n) number of chromosomes. |
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Related Questions
Given below are three diagrammatic sketches (A, B and C) of one and the same particular phase during mitotic type of cell division.
(a) Identify the phase.
(b) What is the diploid number of chromosomes shown in them?
(c) Identify whether these are animal cells or plant cell? Give reasons.
Shown below are four stages (A, B, C, D) (not in sequence) of a certain kind of cell division.
(a) Is it a plant cell or an animal cell? Give two reasons.
(b) Is it undergoing mitosis or meiosis?
(c) What should be the correct sequence of these four stages among themselves?
(d) Name the stage that should precede the earliest of these stages.
(e) Draw the stage named above inside the blank space provided.
Draw a labelled diagram to show the metaphase stage of mitosis in an animal cell having "6" chromosomes.
The diagram given below represents a certain phenomenon which occurs during meiosis. Name and explain the phenomenon by using the terms - homologous chromosomes, chromatids, and crossing-over.
